class ColorUtils {
  // Credit: https://css-tricks.com/snippets/javascript/lighten-darken-color/
  lightenDarkenColor (col, amt) {
    let usePound = false
    if (col[0] === '#') {
      col = col.slice(1)
      usePound = true
    }
    const num = parseInt(col, 16)
    let r = (num >> 16) + amt
    if (r > 255) {
      r = 255
    } else if (r < 0) {
      r = 0
    }
    let b = ((num >> 8) & 0x00FF) + amt
    if (b > 255) {
      b = 255
    } else if (b < 0) {
      b = 0
    }
    let g = (num & 0x0000FF) + amt
    if (g > 255) {
      g = 255
    } else if (g < 0) {
      g = 0
    }
    return (usePound ? '#' : '') + (g | (b << 8) | (r << 16)).toString(16)
  }
}
export const colorUtils = new ColorUtils()
